That explains the bits of cat coming out the tail pipe
I'll take a peak tomorrow. I still have the original 02 sensors in the rear. The front passenger is the only one that has been replaced in 162K according to records. I have had the truck since 2006, my father owned it since 2000. I have searched high and low for 02 replacements and have not found any. I may order the mid pipe with no cats, when do you expect to get your installed? Anyway you could install the mid pipes with no cats on the stock exhaust system and take a video? I have a flow master, so it's slightly louder than stock. No worries if you can't, that is a lot of bolting and unbolted that isn't required on your part.